In the transformer shown in the figure below, the inductance measured across the terminal 1 and 2 was 4 H with open terminals 3 and 4. It was 3 H when the terminal 3 and 4 were short circuited. The coefficient of coupling would be

A. 1
B. 0.0707
C. 0.5
D. indeterminate due to insufficient data
Answer: Option C

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